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The planning for Overlord, like most large military operations, required many different tasks to be coordinated. This required that precise timelines be ready for distribution to thousands of people. Unfortunately, the precise date for the launch was anything but precise; there were many 'fudge factors', of which the weather was one of the biggest.

The solution was to start the program on Day D at Hour H.

One order might be 'embark 4th Infantry D+3'.

Another might be 'emplane 82nd Airborne H-6'.

Commanders everywhere would wait for the signal that gave the date of D Day and the time of H Hour. They could then quickly put the actual date-times onto their orders.

It turned out that, when the planning finally came together, D-Day was about 30 hours long. Many in the planning staff began referring to it as 'the longest day in history' and "the longest day" did get used as a nick-name.

Note. the system of day d and hour h was not invented for the occasion - soldiers have been using it for a long time. The two orders above were invented for this answer and should not be taken as historically correct.
THe answer is the longest Day

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